98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*
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* Author: Hans van Staveren
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*/
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#include "assert.h"
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#include "param.h"
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#include "tables.h"
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#include "types.h"
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#include <cg_pattern.h>
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#include "data.h"
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#include "result.h"
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#include "state.h"
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#include "extern.h"
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#include "subr.h"
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#include "salloc.h"
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extern int nstab; /* salloc.c */
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#ifndef STONSTACK
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extern string myalloc();
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state_p stlist=0;
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#endif
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static void bmove(register short *from, register short *to, register int nbytes)
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{
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if (nbytes<=0)
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return;
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assert(sizeof(short)==2 && (nbytes&1)==0);
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nbytes>>=1;
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do
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*to++ = *from++;
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while (--nbytes);
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}
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#ifdef STONSTACK
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state_p savestatus(register state_p sp)
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{
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#else
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state_p state_p savestatus(void)
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{
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register state_p sp;
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if ((sp=stlist)==0)
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sp = (state_p) myalloc( sizeof( *sp ) );
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else
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stlist=sp->st_next;
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#endif
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sp->st_sh = stackheight;
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bmove((short *)fakestack,(short *)sp->st_fs,stackheight*sizeof(token_t));
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sp->st_na = nallreg;
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bmove((short *)allreg,(short *)sp->st_ar,nallreg*sizeof(int));
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sp->st_ct = curtoken;
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bmove((short *)dollar,(short *)sp->st_do,LONGESTPATTERN*sizeof(result_t));
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bmove((short *)machregs,(short *)sp->st_mr,NREGS*sizeof(struct reginfo));
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sp->st_ne = nemlines;
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bmove((short *)emlines,(short *)sp->st_el,nemlines*sizeof(struct emline));
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sp->st_em = emp;
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sp->st_se = saveemp;
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sp->st_tl = tokpatlen;
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sp->st_ns = nstab;
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#ifndef STONSTACK
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return(sp);
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#endif
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}
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void restorestatus(register state_p sp)
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{
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stackheight = sp->st_sh;
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bmove((short *)sp->st_fs,(short *)fakestack,stackheight*sizeof(token_t));
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nallreg = sp->st_na;
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bmove((short *)sp->st_ar,(short *)allreg,nallreg*sizeof(int));
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curtoken = sp->st_ct;
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bmove((short *)sp->st_do,(short *)dollar,LONGESTPATTERN*sizeof(result_t));
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bmove((short *)sp->st_mr,(short *)machregs,NREGS*sizeof(struct reginfo));
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nemlines = sp->st_ne;
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bmove((short *)sp->st_el,(short *)emlines,nemlines*sizeof(struct emline));
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emp = sp->st_em;
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saveemp = sp->st_se;
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tokpatlen = sp->st_tl;
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popstr(sp->st_ns);
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}
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#ifndef STONSTACK
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void freestatus(state_p sp)
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{
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sp->st_next = stlist;
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stlist = sp;
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}
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#endif
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